Room Overlay

The Room Overlay is one of the Overlays in Oxygen Not Included. Rooms confer a variety of bonuses, but most rooms will provide a buff to Duplicant morale.

A room can only be one type, if a room meets the requirements of multiple types of room simultaneously then it will be treated as a "miscellaneous room" with no bonus until it is specialized as a single type.

The room size requirements are measured in two-dimensional area, so a rectangular room 10 tiles wide and 4 tiles high has a room size of 40 tiles.

Miscellaneous Room
This area qualifies as a room but has no dedicated use.
 * Enclosed by wall tiles (and doors)

The game has detected that this area is small enough to count as an enclosed room but it has not recognized the contents as one of the other room types below.

Washroom
Using a fully plumbed Washroom will improve Duplicants' Morale
 * One or more flush toilets (Lavatory)
 * One or more plumbed wash stations (Sink, Shower or Hand Sanitizer)
 * No Outhouses
 * No Industrial machinery
 * Size range: 12-64 tiles

Morale Bonus: +2

The improved version of the Latrine using plumbed toilets and sinks. Washrooms can contain Wash Basins but must have at least one Sink, Shower or Hand Sanitizer.

Latrine
Using a toilet in an enclosed room will improve Duplicants' Morale
 * One or more basic toilets (Outhouse)
 * At least one wash station (Wash Basin, Sink, Shower or Hand Sanitizer)
 * No Industrial machinery
 * Size range: 12-64 tiles

Morale Bonus: +1

The Latrine is the basic version of the Washroom. Note that Composts do not count as "Industrial machinery" so you can include them in your Latrine to prevent duplicants carrying Polluted Dirt outside of the bathroom (and getting covered in Food Poisoning again from handling it).

Bedroom
Sleeping in a comfortable bedroom will improve Morale for Duplicants
 * At least one Luxury Bed (Comfy Bed)
 * No basic Cots
 * No Industrial machinery
 * Size range: 12-64 tiles
 * Decoration Item
 * Minimum ceiling height: 4 tiles

Morale Bonus: +2

Accelerated Stamina Recovery: +200% (per cycle, +0.33% per second) if it's a Private Bedroom (only one Comfy Bed in the room), no additional stamina recovery otherwise.

The upgraded version of the Barracks.

Barracks
Sleeping in a bed will improve Morale for Duplicants if it is located in a Barracks
 * At least one bed (Cot or Comfy Bed)
 * No Industrial machinery
 * Size range: 12-64 tiles

Morale Bonus: +1

Accelerated Stamina Recovery: +100% (per cycle, +0.167% per second)

A common tactic is to build Barracks 4 tiles high and fill them with Paintings to buff Duplicant's "Average Decor this cycle" while they sleep. This design makes it easy to upgrade to a Bedroom as soon as enough Plastic is available for Comfy Beds.

Great Hall
Eating and relaxing in a Great Hall will significantly improve Duplicants' Morale
 * At least one Mess Table
 * No Industrial machinery
 * Size range: 32-120 tiles
 * Decor item: 20+ decor (minimum of 1 item with decor rating 20+)
 * Recreational Building

Morale Bonus: +6

The upgraded version of the Mess Hall. A Bluff Briar will meet the decor requirement even if you don't have Art Student duplicants. A Water Cooler will meet the recreation item requirement. These requirements are actually quite easy to meet in the early game.

Mess Hall
Eating at a Mess Table will improve Morale for Duplicants if it is located within a Mess Hall
 * At least one Mess Table
 * No Industrial machinery
 * Size range: 12-64 tiles

Morale Bonus: +3

The low requirements for a Mess Hall room make it an excellent source of Morale in the early game.

Hospital
Sick Duplicants assigned to medical buildings located within a Hospital are less likely to spread disease
 * At least one medical equipment (Triage Cot, Disease Clinic, Sick Bay)
 * At least one toilet (Outhouse or Lavatory)
 * At least one Mess Table
 * No Industrial machinery
 * Size range: 12-96 tiles

While the room itself does not have any bonuses, and isn't required for the medical buildings to function, Duplicants assigned to the medical equipment in the room will also use the toilet and mess table in it, potentially reducing travel time.

Massage Clinic
Massage Tables reduce more stress when in a proper room
 * At least one Massage Table
 * No Industrial machinery
 * Decoration item
 * Size range: 12-64 tiles

Massage Tables +100% efficiency

The Clinic doubles the stress reduction effect of massage tables from -3% per minute to -6% per minute.

Power Plant
Electrical engineers can tune-up generators built within a Power Plant, improving their power production
 * Power Control Station
 * Size range: 12-96 tiles

The room itself has no effect. Only a Duplicant with the Electrical Engineering skill can use the Power Control Station to upgrade any power generators in the room (+50% power for no extra fuel cost). However, the buff is temporary (3 cycles) and it consumes 5 kg of Refined Metal each time.

Greenhouse
Crops grown within a greenhouse can be tended by farmers to increase their growth speed.
 * Farm Station
 * Size range: 12-96 tiles

The room itself has no effect. Duplicants who have mastered the Crop Tending skill can make Micronutrient Fertilizer at the Farm Station to apply a double growth speed buff for 1 cycle at the cost of 5 kg of Fertilizer per plant.

Stable
Stabled critters will be more productive and less hostile.
 * Grooming Station
 * Size range: 12-96 tiles

The room itself has no effect (Expressive Update). The Grooming Station will display an error icon if built outside a Stable, but it will continue to function regardless.

Recreation Room
Leisure time will further improve Morale for Duplicants visiting a Recreation Room
 * At least one Recreational Building
 * At least one decorative building
 * No Industrial machinery
 * Size range: 12-96 tiles

Despite the description, the room does not have any direct effects. Duplicants will "mingle" during downtime in a Recreation Room if they have nothing else to do. "Mingling" basically just means that they will engage in conversation activities (the same ones that can randomly occur when near each other during work time). These activities generate a variety of small stress reduction buffs that last around 45–60 seconds each but do not affect morale.

Park
Passing through natural spaces throughout the day will raise the Morale of Duplicants.


 * At least one Park Sign
 * At least two wild plants
 * No Industrial machinery
 * Size range: 12-64 tiles

Morale Bonus: +3

It isn't necessary for duplicants to spend any noticeable time in the park to obtain the buff, simply entering the room is sufficient, or even passing through the room in a transit tube. Clever room design can minimise any time delay to duplicant work schedules.

Nature Reserve
A Nature Reserve will grant higher Morale bonuses to Duplicants than a Park


 * At least one Park Sign
 * At least four wild plants
 * No Industrial machinery
 * Size range: 32-120 tiles

Morale Bonus: +6

Upgraded version of the Park, requiring more space and wild plants but also giving double the morale bonus.